JP6922110B1 - Crushing / stirring / mixing / kneading machine parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crushing / stirring / mixing / kneading machine member which is lightweight, has excellent impact resistance and wear resistance, and has magnetism, and prolongs the life of these members. SOLUTION: The mass ratio of each element is Ti: 20 to 45%, Mo: 5 to 35%, W: 6 to 30%, C: 5 to 15%, Co: 10 to 50%, and the total of Co and Ni. The raw materials are mixed so as to be more than 25 to 50% in water, and they are mixed to obtain a mixed powder, and this mixed powder is press-molded to obtain a pressed body, and the cermet obtained by sintering this pressed body is used. It is a member of a crushing / stirring / mixing / kneading machine. This cermet exists so as to cover the periphery of the core phase 2 containing TiCN as the main component, the rim phase 3 containing (Ti, Mo, W) (C, N) as the main component, and the metal phase. It has 3 phases of 4, and the average particle size of the hard phase composed of the core phase and the rim phase in the cross-sectional structure observation is less than 3 μm, and the WC phase and the Mo2C phase cannot be observed by SEM observation. [Selection diagram] Fig. 1

Description

The present invention relates to a crushing / stirring / mixing / kneading machine member made of a cermet having excellent impact resistance and wear resistance.

Various material design methods have been proposed for cermets having excellent impact resistance and wear resistance.

In Patent Document 1, the pores and the bound phase pool are eliminated by a three-step sintering method of temporary sintering in a reduced pressure nitrogen atmosphere, HIP treatment, and final heat treatment in a reduced pressure nitrogen atmosphere, and the TiN / TiC ratio is obtained. However, a method for producing a cermet having a high strength is disclosed even from 3/7 to 7/3. Such carbonitride-based cermets are used in cutting tool applications such as milling.

In Patent Document 2, the microstructure is rich in WC with excellent toughness around the central core, as opposed to the conventional cermet which has a two-phase structure of a core composed of a hard phase and a rim which is a peripheral structure having toughness. Cermets with higher toughness are disclosed by forming the third phase. Compared with conventional cermets, this cermet improves bending strength and breaking toughness without lowering wear resistance and hardness, and is a part that requires wear resistance and toughness as well as a machine tool tool. , Can be widely applied as a member.

In Patent Document 3, the cermet has improved impact resistance, wear resistance, and heat-resistant plastic deformation by increasing the amount of nitride, controlling the hard phase particle size to relatively coarse particles, and further strengthening the bonded phase. Is disclosed. By devising this method, we have solved the problem of shortening the life of cutting tools due to defects caused by thermal cracks in cutting tools that are subjected to intense thermal shock intermittently.

In Patent Document 4, TiC is 5 to 50%, _{one or more of Mo 2} C, TaC, VC, Cr ₃ C ₂ , NbC, ZrC, and HfC is 1 to 25%, and Ni and Co are combined. A cermet for a hot guide roller is disclosed, which contains 5 to 40% of the above, and has an average particle size of TiC of 1.5 to 15 μm and a WC particle size of 3 to 15 μm. In this cermet, the coarse hard particles can suppress the growth of surface cracks, which is the biggest problem of hot rolling, and improve the life of the hot guide roller.

Patent Document 5 discloses that by controlling the lattice constant of the bonding phase containing Ni and Co as main components to 3.545 Å or less, the thermal crack resistance is improved and the life of the high-speed cutting tool is improved. There is.

Further, in recent years, the demand for lightweight high-performance resin materials has increased, and the production of reinforced resin materials highly filled with fillers such as glass fibers and inorganic powders has been increasing in order to improve the characteristics thereof. Along with this, there is a problem that the production efficiency is lowered due to severe wear of the crushing / stirring / mixing / kneading machine member. In resins for precision electronic parts, metal contamination due to wear of members is an issue, and not only removal by magnetic separation but also improvement of suppressing wear of members, which is a mixing source, is required as a drastic measure.

Nitrided steel is often used as a member for crushing, stirring, mixing, and kneading machines, but alloy tool steel is used for applications that require more wear resistance, and cemented carbide is used for harsher usage conditions. Is known to be suitable.

Patent Document 6 describes kneading having a complicated shape by sintering and joining a plurality of disk components made of cemented carbide, which has higher wear resistance than conventional alloy tool steel, by discharge plasma sintering. Disclosed is the manufacture of a kneading disc that facilitates disc polishing and cutting and has excellent wear resistance.

In Patent Document 7, by pressure-sintering a cemented carbide split body in the axial direction, even an elongated screw or cylinder can be constructed without deformation. A cemented carbide molding member that can be used continuously is disclosed.

Japanese Unexamined Patent Publication No. 61-003852 Japanese Unexamined Patent Publication No. 62-196352 Japanese Unexamined Patent Publication No. 63-109139 Japanese Unexamined Patent Publication No. 2-66135 JP-A-7-112313 Japanese Unexamined Patent Publication No. 11-10709 Japanese Unexamined Patent Publication No. 2011-88410

Kawabata, Fujimura, Chitoku "Powder and Powder Metallurgy" Vol. 29, No. 1 (1980), 30-34

When the cermet disclosed in Patent Document 1 is applied to a crushing / stirring / mixing / kneading machine member, it has a relatively small amount of metal phase, so that shock absorption due to elastic deformation is insufficient and the toughness of the material itself is low. Therefore, there is a risk of destruction due to the impact of contact between the members in operation.

Since the cermet disclosed in Patent Document 2 contains WC single particles, there is a concern that hard WC particles are likely to be the starting point of fracture and are inferior in impact resistance. Therefore, as described above, cracks may occur due to member contact during crushing, stirring, mixing, and kneading machine member operation. Further, since a large amount of WC having a high specific gravity is contained, the weight of the member becomes heavy, and when applied to a rotating device member, there is a concern that shaft shake may occur and the load on the drive device may increase.

Cermet disclosed in Patent Document 3 is intended for application to cutting tools, small metal phase amount, further WC in the metal phase, for Mo 2 _C single particles are present, pulverized and stirred and mixed, It cannot be used because it has insufficient toughness and impact resistance to be applied as a kneader member.

In the cermet disclosed in Patent Document 4, WC coarse-grained powder is added for the purpose of suppressing thermal cracks, but WC coarse-grained powder is missing in the crushing / stirring / mixing / kneading machine member in which abrasive wear occurs. As a result, there is a problem that the amount of volume reduction increases and the life of the member is shortened.

Since the cermet disclosed in Patent Document 5 is premised on application to a cutting tool, it has a small amount of metal phase and lacks impact resistance and toughness. Therefore, it is used as a crushing / stirring / mixing / kneading machine member. Not suitable for use in.

Since the kneading disc and the molding member disclosed in Patent Document 6 and Patent Document 7 are made of cemented carbide having high wear resistance, it is possible to improve the life of the member. However, conventional crushing / stirring / mixing / kneading machines are designed on the premise that members made of steel materials are mounted, and cemented carbide members increase the load on the drive unit side and rotate due to their high specific gravity. There is an unsolved problem that it is not suitable as a replacement application from steel material members due to the deflection of the shaft.

The present invention has been made to solve the above problems, and provides a crushing / stirring / mixing / kneading machine member which is lightweight, has excellent impact resistance and wear resistance, and has magnetism. An object is to extend the life of these members.

In the present invention, the mass ratio of each element is
Ti: 20-45%
Mo: 5-35%
W: 6 to 30%
C: 5 to 15%
Co: 10-50%
Co and Ni total over 25-50%
A powder arbitrarily selected from Ti or Ti compound, Mo or Mo compound, W or W compound, Co or Co compound, Ni or Ni compound and carbon is used as a raw material, and they are mixed wet or dry. Then, a step of obtaining a mixed powder, a step of press-molding the mixed powder at a pressure of 50 to 300 MPa to obtain a pressed body, a step of temporarily sintering the pressed body in a vacuum or a gas atmosphere at 600 to 1000 ° C., and then 1300 to 1700. It is obtained through the steps of sintering in any of the atmospheres of ° C, vacuum, reduction, inert gas, hydrogen or nitrogen, and exists so as to surround the core phase containing TiCN as a main component and the core phase. It has three phases, a rim phase containing (Ti, Mo, W) (C, N) as a main component and a metal phase, and the average particle size of the hard phase composed of the core phase and the rim phase in cross-sectional structure observation is 3 μm. less than, by SEM observation, it can not be observed WC phase and Mo 2 _C phase, to provide a cermet for grinding and stirring, mixing, kneader member, has solved the problems.

The cermet obtained in the present invention, which has magnetism, is lightweight, and has significantly improved wear resistance and impact resistance, can prolong the life of crushing, stirring, mixing, and kneading machine members that are severely worn. It became.
Specific examples of crushing / stirring / mixing / kneading machine members include screw elements and barrels for twin-screw extruders, crushing pins for pin mills, paddles for mixing and stirring machines, and powder processing device members for bead mills. It can be preferably used.

Schematic diagram of the cross-sectional structure of the cermet used for the crushing / stirring / mixing / kneading machine member of the present invention. FIG. 6 is a schematic view of a cross-sectional structure of a cermet having a phase containing a large amount of Mo and W relative to the rim phase used in the crushing / stirring / mixing / kneading machine member of the present invention. SEM observation image of cermet used for crushing / stirring / mixing / kneading machine member of Example 1.

The crushing / stirring / mixing / kneading machine member of the present invention can be carried out with the following contents.

First, the mass ratio for each element is
Ti: 20-45%
Mo: 5-35%
W: 6 to 30%
C: 5 to 15%
Co: 10-50%
Co and Ni total over 25-50%
As a raw material, a powder arbitrarily selected from Ti or Ti compound, Mo or Mo compound, W or W compound, Co or Co compound, Ni or Ni compound and carbon is used as a raw material.
For example, as a compound of Ti, carbides such as TiC, TiN, TiCN, (Ti, Mo) (C, N), (Ti, W) (C, N), nitrides, carbonitrides, composite carbonitrides It does not matter which form is used. The same applies to Mo, W, Co, and Ni.
Then, they are mixed wet or dry to obtain a mixed powder, and the mixed powder is press-molded at a pressure of 50 to 300 MPa to obtain a pressed body, and the pressed body is vacuumed, reduced, or not at 1300 to 1700 ° C. By sintering in an atmosphere of active gas, hydrogen or nitrogen, a crushing / stirring / mixing / kneading machine member made of cermet is obtained. This cermet has three phases, a core phase, a rim phase, and a metal phase, and the specific design of each phase will be described below. In the following description, the mass ratios for each element are those at the raw material stage.

(Core phase / rim phase design)
When C is 5 to 15%, the sinterability is improved and a hard phase composed of a fine core phase and a rim phase is formed. If C is less than 5%, a sufficient volume of core phase and rim phase will not be generated and wear resistance will decrease. On the other hand, when C is added in an amount of more than 15%, a free carbon phase is generated, and the mechanical properties (strength, hardness, impact resistance) are significantly lowered.
When N is added, it can be arbitrarily added in the range of more than 0 and within 5%. By adding N, the thickness of the rim phase tends to be reduced, and wear resistance and impact resistance are improved. Further, by setting N to 5% or less, it is possible to suppress residual pores in the alloy due to nitrogen gas generated during sintering, and it is possible to improve mechanical properties.
Further, it is desirable that C: N = 7: 3 to 10: 0. By setting the C: N ratio in this range, good wettability between the metal phase and the hard phase composed of the core phase and the rim phase can be maintained, and the denseness is improved.
Mo is mixed in the range of 5 to 35% and W is mixed in the range of 6 to 30%. The wettability between TiCN forming the core phase and Co and Ni forming the metal phase is poor, but the _{rim phase produced by adding Mo 2} C and WC is a hard phase consisting of a core phase and a rim phase. Wetness can be improved. As a result, the sinterability of the material is improved, and the mechanical properties can be improved.
Further, by adding W, the wear resistance can be further improved. This is because the hard phase composed of the core phase and the rim phase is solid-solved and strengthened by W atoms, and the hard phase is less likely to be destroyed during abrasive wear.
When Mo and W are combined to 35% or less, W and Co, Mo and Co, or W and Mo and Co alloys are not formed, and impact resistance is improved.

(Metal phase design)
Co and Ni total more than 25-50%. If the amount of metal is less than this range, the impact resistance becomes insufficient. If the amount is large, the wear resistance is lowered, and the crushing / stirring / mixing / kneading machine member is severely worn.
Co is 10 to 50%. By setting Co, which has better mechanical properties (hardness, wear resistance) than Ni, in this range, it is possible to improve the mechanical properties of crushing, stirring, mixing, and kneading machine members and extend their life. can.
Further, the cermet containing 10% or more Co has sufficient magnetism required for magnetic separation. Magnetic separation is used in a crushing / stirring / mixing / kneading machine device when detecting foreign matter in a material by chipping a member or the like.

The crushing / stirring / mixing / kneading machine member of the present invention can be manufactured by the following manufacturing method as an example.
(Production method)
The following steps are included in the production of the crushing / stirring / mixing / kneading machine member of the present invention.
That is, the mass ratio of each element is
Ti: 20-45%
Mo: 5-35%
W: 6 to 30%
C: 5 to 15%
Co: 10-50%
Co and Ni total over 25-50%
A powder arbitrarily selected from Ti or Ti compound, Mo or Mo compound, W or W compound, Co or Co compound, Ni or Ni compound and carbon is used as a raw material and mixed by a wet or dry method. And the steps to get the mixed powder,
The step of press-molding the mixed powder at a pressure of 50 to 300 MPa to obtain a pressed body,
The step of sintering the pressed body at 1300 to 1700 ° C. under any atmosphere of vacuum, reduction, inert gas, hydrogen or nitrogen.
In the case of wet mixing, a volatile solvent such as ethanol is used as a solvent, and the slurry is dried by vacuum static drying, spray drying, or the like. At this time, it is desirable that the particle size of the particles forming the core phase and the rim phase after mixing the raw materials is 0.6 μm or less.
Granulation is performed by mixing the obtained fine powder with a resin component to be a molding binder. Spray dry may be used for granulation.
The granulated powder is press-molded at 50 to 300 MPa with a die press or a hydrostatic press. After molding, intermediate processing may be added if necessary.
As for the sintering conditions, first, degreasing / temporary sintering is performed in a vacuum or gas atmosphere of 600 to 1000 ° C., and then main sintering is performed in a vacuum or gas atmosphere of 1300 to 1700 ° C. Temporary sintering and main sintering may be performed continuously. Further, hot hydraulic pressing is performed if necessary.
Finally, the final shape is finished by machining or electric processing to obtain the desired crushing / stirring / mixing / kneading machine member.

(Cermet structure used for crushing / stirring / mixing / kneading machine members)
As the cross-sectional structure 1 of the cermet used in the present invention is schematically shown in FIG. 1, the core phase 2 containing TiCN as a main component and the cermet used so as to cover the periphery of the core phase 2 (Ti, It has three phases, a rim phase 3 containing Mo, W) (C, N) as main components and a metal phase 4, and the average particle size of the hard phase composed of the core phase and the rim phase in cross-sectional structure observation is less than 3 μm. in and, WC phase and Mo 2 _C phase in the cermet does not contain in principle. When there is a WC phase and a Mo ₂ C phase, they are present in the metal phase in particle shapes having different brightness in addition to the core phase and the rim phase in SEM (scanning electron microscope) observation. EPMA If in doubt the (electron microprobe) and EDX (energy dispersive X-ray analysis) was analyzed by XRD (X-ray diffraction), comprehensive evaluation for the presence of WC phase and Mo ₂ C phase do. Even when observed irregularly, there are 1 or less particles of 1 μm or more and 5 or less particles of 0.3 μm or more in a 10,000-fold observation field of view. In the present invention "by SEM observation, WC phase and can not be observed Mo 2 _C phase" A, 1 [mu] m or more of the particles one or less in 10,000 times the observation field of the foregoing, also 0.3μm The case where the number of the above particles is 5 or less is also included.
With the above configuration, a material having high impact resistance and wear resistance can be obtained.
The structure of this cermet is confirmed by cross-sectional observation by SEM.

（式１）中、ｄ_ｍは平均粒径、πは円周率、Ｎ_Ｌは断面組織上の任意の直線によってヒットされる単位長さあたりの粒子数、Ｎ_Ｓは任意の単位面積内に含まれる粒子の数を表し、（式２）中、ｎ_Ｌは断面組織上の任意の直線によってヒットされる粒子の数、Ｌは断面組織上の任意の直線の長さを表し、（式３）中、ｎ_Ｓは任意の測定面積内に含まれる粒子の数、Ｓは任意の測定領域の面積を表す。 In addition, the cermet has the following characteristics.
(Core phase)
The core phase is a hard phase containing TiCN as a main component and has high hardness.
(Rim phase)
The rim phase exists so as to cover the circumference of the core phase, _{and is mainly composed of (Ti,} Mo, W) (C, N). As shown in FIG. 2, the rim phase may have two phases, a phase having a relatively large amount of Mo component and a W component and a phase having a relatively large amount of Ti component. In the case of two phases, the hardness of the rim phase is improved and the wear resistance is further increased.
(Particle size)
The average particle size of the hard phase composed of the core phase and the rim phase is less than 3 μm. The average particle size can be calculated from the following Fulman's formula (Equation 1) by observing the cross-sectional structure of the cermet by SEM.

(In the formula 1), d _m average particle size, [pi is pi, N _L is the number of particles per unit length which is hit by an arbitrary straight line on the cross-sectional structure, N _S is in any unit area In (Equation 2), n _L represents the number of particles hit by an arbitrary straight line on the cross-sectional structure, L represents the length of an arbitrary straight line on the cross-sectional structure, and represents (Equation 3). ), N _S represents the number of particles contained in an arbitrary measurement area, and S represents the area of an arbitrary measurement region.

By making the average particle size of the hard phase consisting of the core phase and the rim phase less than 3 μm, the mechanical properties and impact resistance are improved. Hard to destroy when joined. In particular, by setting the average particle size of the hard phase to 1.5 μm or less, the hardness is further improved and the wear resistance is also improved. When the average particle size of the hard phase is 3 μm or more, the unit of particle shedding during abrasive wear becomes large, and the wear resistance is remarkably lowered.

(specific gravity)
The crushing / stirring / mixing / kneading machine member according to the present embodiment has a specific gravity of 9 or less. Conventionally, the crushing / stirring / mixing / kneading machine has been designed on the premise that a member made of steel material is mounted. Therefore, when the specific gravity of the member exceeds 9, the rotating shaft is bent and the drive device side is affected. It may cause an increase in load. When the specific gravity is 8 or less, it can be treated in the same manner as a steel material, and when the specific density is 7.5 or less, it is lighter than a steel material, and the degree of freedom in device design can be increased.

The cermet having the above characteristics has wear resistance and impact resistance as high as those of cemented carbide, but has a specific gravity equivalent to that of steel material and is magnetic. By applying this material as a crushing / stirring / mixing / kneading machine member, it is possible to suppress damage due to contact between the members and wear of the member during use, and to achieve a long life of the member.

First, the raw material powders shown in Example 1 of Table 1 were pulverized and mixed by an attritor or a ball mill using ethanol as a solvent. The obtained slurry was dried in a vacuum, mixed with paraffin as a binder, and then press-molded to prepare a pressed body.
By temporarily sintering this pressed body at 800 ° C. in an atmospheric pressure hydrogen atmosphere and further performing main sintering at 1400 ° C. in a vacuum atmosphere, the cermet used for the crushing / stirring / mixing / kneading machine member of the present invention. Got
The cermet obtained in Example 1 had an average particle size of 1.12 μm calculated by the above-mentioned Fulman's formula.
Examples and Comparative Examples after Example 2 were sintered at the lowest temperature in which the highest density was obtained in the range of 1300 to 1500 ° C. Other conditions are the same as in Example 1.
Moreover, in all Examples and Comparative Examples except Comparative Example 6, the average particle size of the hard phase composed of the core phase and the rim phase was less than 1.5 μm.
Further, observation of the constituents of the cermet sectional structure by SEM observation, in all embodiments, the presence of Mo 2 _C phase and WC phases could not be confirmed. Further, in all the examples, a phase having a relatively large amount of Mo component and W component was present in the rim phase.
The element composition ratio of the entire cermet structure had a large deviation from the raw material composition, and the coefficient of determination of the raw material composition and the component ratio of the cermet after sintering was low, so that it could not be quantified accurately. For reference, Table 3 shows the results of quantitative analysis by EPMA and EDX for the cermet of Example 1, and the deviation from the raw material composition can be confirmed. It is considered that the reason for this is that the change in the lattice state due to the formation of a solid solution between the constituent elements has an effect. As described in Non-Patent Document 1 above, it is known that it is difficult to quantify the alloy composition of a cermet material even in past studies, and accurate quantification is difficult.
Thus, in the present invention, it is impossible or approximately impractical to directly identify the object by its structure or properties, and the present invention has so-called "impossible / impractical circumstances". exist.

Subsequently, the mechanical properties of the produced cermet were evaluated by the measurement method shown below.
* Relative density: Archimedes method (standard: JIS Z 8807)
* Hardness: Vickers hardness test (Standard: JIS Z 2244)
* Abrasion resistance: Rubber wheel test (standard: ASTM G65)
* Impact resistance: Charpy impact test (standard: JIS Z 2242)
* Magnetism: Saturation magnetization measurement

Table 4 shows the characteristics of cermets in Examples and Comparative Examples of the present invention.

In all the examples, the specific gravity was suppressed to 9 or less, which was the target, and the wear resistance also exceeded that of cemented carbide (JIS classification: V40 equivalent material), and exhibited excellent characteristics. In addition, the impact resistance ^{has achieved 6 J / cm 2} or more, which was difficult to achieve with conventional cermets.

Examples 2 and 6 showed particularly high wear resistance as compared with Example 1.
In Example 2, the amount of Mo added was relatively large, and by further adding W, the hardness was improved, and despite the fact that the amount of metal was the same as that of Example 1, high wear resistance was exhibited.
In Example 6, although the Charpy impact value was ^{less than 10 J / cm 2} , the wear resistance exceeded 200% as compared with the cemented carbide (JIS classification: V40 equivalent material). This is an example in which extremely high wear resistance is exhibited by keeping the amount of metal to the minimum necessary.

In Comparative Example 1, the amount of Mo added was larger than that of the present invention, and the wear resistance was very high. However, since the Charpy impact value is low and there is a risk of breakage, it cannot be used as a crushing / stirring / mixing / kneading machine member.
In Comparative Example 2, since the amount of W added was excessive, a WC phase was formed, and the wear resistance was significantly reduced.
In Comparative Example 3 and Comparative Example 7, only Ni was used as the metal phase. This sample showed low values in hardness, wear resistance, and magnetism because the metal phase was only Ni, although the amounts of Mo, W, and metal phases were within the range. It can be said that the addition of Co is indispensable for the development of magnetism.
When the amount of Mo and W added was small as in Comparative Example 4, the wear resistance showed a low value.
In Comparative Example 5, the amount of metal phase (total of Co and Ni) is 24%, which is lower than the lower limit of the present invention. Similar to general cermets mainly used for tools, it has high wear resistance, but its fracture toughness, bending force, and Charpy impact value are low.
Comparative Example 6 is a sample prepared using the same raw materials as in Example 1 without sufficient pulverization. After sintering, the average particle size of the hard phase composed of the core phase and the rim phase exceeded 3 μm, so that the hardness and impact resistance were lowered.
In Comparative Examples 8 to 10, although the amount of the metal phase was within the range, the amount of Co having high mechanical properties such as hardness and wear resistance was insufficient, so that the wear resistance was lowered. The magnetism also showed a lower value than that of cemented carbide materials.

FIG. 3 shows an SEM observation image of the cermet of Example 1. The darkest part is the core phase, the next darkest part is the rim phase, and the lightest part is the metal phase.

1 Cross-sectional structure of cermet 2 Core phase 3 Rim phase 4 Metal phase 5 Phase with relatively large amounts of Mo and W

Claims (4)

The mass ratio of each element is
Ti: 20-45%
Mo: 5-35%
W: 6 to 30%
C: 5 to 15%
Co: 10-50%
Co and Ni total over 25-50%
As a raw material, a powder arbitrarily selected from Ti or Ti compound, Mo or Mo compound, W or W compound, Co or Co compound, Ni or Ni compound and carbon is used as a raw material.
Steps of mixing them wet or dry to obtain a mixed powder,
A step of press-molding the mixed powder at a pressure of 50 to 300 MPa to obtain a pressed body,
The press is temporarily sintered in a vacuum or gas atmosphere at 600 to 1000 ° C., and then sintered in a vacuum, reduction, inert gas, hydrogen or nitrogen atmosphere at 1300 to 1700 ° C.. It is a crushing / stirring / mixing / kneading machine member made of cermet gas.
It has three phases: a core phase containing TiCN as a main component, a rim phase containing (Ti, Mo, W) (C, N) as a main component, and a metal phase, which exists so as to cover the periphery of the core phase. ,
The average particle size of the hard phase consisting of the core phase and the rim phase in cross-sectional structure observation is less than 3 μm.
By SEM observation, it is impossible to observe the WC phase and Mo 2 _C phase, cermet, pulverized and stirred and mixed-kneader member.
The crushing / stirring / mixing / kneading machine member made of cermet according to claim 1, wherein the mass ratio of N in the raw material is more than 0 and 5% or less. The crushing / stirring / mixing / kneading machine member comprising the cermet according to claim 1 or 2, wherein the mass ratio of C and N in the raw material is C: N = 7: 3 to 10: 0. The cermet according to any one of claims 1 to 3, wherein the rim phase has two phases, a phase having a relatively large amount of Mo and W and a phase having a relatively large amount of Ti. Kneader member.

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